I upgraded bestsync 2015 premium version to bestsync 2017 business version.The activation proces was succesfull.But each time I restart Bestsync the key is lost, and i have to re-activate the license again.It seems the activation key is not stored in windows registry (or elsewhere?)How can I fix this problem?

If the hardware construct (HDD, network card) of the PC changes, the license information will be invalidated. If it is in the above case, please activate the license again.If it is NOT the above case, we are investigating the cause of the problem, but reactivate the license again may be a solution.